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Problem with Notebook/3D Monitor connections: HDMI 1.4/Dual Link DVI/VGA

post #1 of 7
1/12/11 at 12:06pm
Thread Starter 
I have a notebook capable of nVidia's 3DVision with HDMI 1.4 and VGA outputs (No DVI). The external 3DVision monitor I want to get only does 3D with a Dual-Link DVI-D input.

From what I've read, the only HDMI cable that is electrically compatible with Dual-Link DVI is the Type B, which as far as I know hasn't actually been produced yet. Also, I understand that the specs for HDMI 1.4 limit the refresh rate to 24Hz for 1080p, which is rather low, although I don't know if the video card (460M) is capable of forcing 120Hz somehow.

So, do you have any thoughts on how to connect this monitor?

As I mentioned, the only other output my notebook has is VGA. If I still want an LCD monitor and no HDMI->DVI converter exists for my particular case, would it be reasonable to look for a different one that can do 1680x1050 (306 MHz of the 400MHz of the VGA spec) at 120Hz?
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post #2 of 7
1/12/11 at 2:25pm
If your Laptop is not capable of ouputing dual like DVI over it's DVI output connector haveing a dual link DVI cable won't help you at all.
A dual link HDMI cable would not help you sice your monitor will only accept a dual link DVI cable.
I don't think there is any for your laptop to support the monitor you are considering with 120hz CONTENT. Why do you think you need a monitor that supports 120Hz input?
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post #3 of 7
1/12/11 at 2:28pm
I will only mention that there are new hdmi 1.4 monitors, e.g. Acer HS244HQ, also Planar and Lenovo, not sure if you looked into that, if they are available or if thet do what you need.
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post #4 of 7
1/12/11 at 6:11pm
Thread Starter 
Quote:
Originally Posted by walford View Post

If your Laptop is not capable of ouputing dual like DVI over it's DVI output connector haveing a dual link DVI cable won't help you at all.
A dual link HDMI cable would not help you sice your monitor will only accept a dual link DVI cable.
I don't think there is any for your laptop to support the monitor you are considering with 120hz CONTENT. Why do you think you need a monitor that supports 120Hz input?

Well, I could be wrong, but I thought that the frequency of the shutter glasses had to match the frequency of the input. So a 24Hz signal to the monitor means a 24Hz refresh rate for the glasses, which would cause a lot of flickering and headaches. 120Hz seems to be the standard for smooth 3D with active shutter glasses.

As far as cables to use I was talking about an adapter. A Type A HDMI->Dual Link DVI adapter is quite common, but for a 3D image I think I may actually need a Type B HDMI->Dual Link DVI adapter which doesn't exist yet. But since I'm still learning about all of this stuff, I don't know for sure.

If the glasses and monitor refresh at 120Hz no matter what the monitor input is, then I guess I could just go with a new HDMI 1.4 monitor like Roussi suggested. The problem with that is the 24Hz limitation for HDMI 1.4, which is pretty low for PC gaming.
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post #5 of 7
1/12/11 at 6:42pm
24Hz frame packing (1080p+1080p at 24Hz) is converted to 120Hz frame sequencing 3D (60Hz per eye) *inside* a HDMI 1.4a display. But HDMI 1.4a limits S3D gaming to 720p+720p at 60Hz. Currently no HDMI transmitter can transmit 1080p+1080p at 60Hz or 1080p at 120Hz (60Hz per eye) because of the bandwidth limitation. Type A HDMI->Dual Link DVI adapter is useless (half of the TMDS data pins in the dual-link DVI won't be used).

What 3D display are you going to get? The displays that will work are:

- Every HDMI 1.4a HDTV/PJ; 1080p 24Hz frame packing (or 720p 60Hz frame packing for gaming) over HDMI; the bundled emitter/glasses
- Mitsubishi/Samsung 3D DLP HDTV; 1080p 60Hz checkerboard over HDMI; DLP-Link glasses or 3D Vision Kit
- Some 720p 120Hz DLP PJ (e.g. Acer H5360); 720p 120Hz frame sequencing over HDMI; DLP-Link glasses or 3D Vision Kit

But if you are thinking of a 3D Vision-certified LCD monitor, you are out of luck without dual-link DVI output as only dual-link DVI can transmit 1080p 120Hz frame sequencing (precisely speaking, there are some models that support 120Hz frame sequencing via VGA).
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post #6 of 7
1/12/11 at 10:10pm
Thread Starter 
Awesome, thanks, that was quite helpful. It's pretty damn confusing; I'm thinking about returning this laptop because of a lack of DVI out. I will look into these displays and if they don't work out, I may just go the VGA route.
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post #7 of 7
1/13/11 at 6:50am
A 120HZ LCD/LED display always refreshs it's screen at 120hz with the contents of a separatly maintained output buffer. So if an image is left in the output buffer for 1/24 of a second the image will be displayed five times.
The following Link may help you in picking a display:

http://store.nvidia.com/DRHM/store?A...tID=111286000#
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